From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5147CCCD183 for ; Mon, 13 Oct 2025 20:36:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=4pak3PzWX14tdOV4jDxU4oibUGbKEwQFf+VrOwDwaVQ=; b=jMMMMrXEXE9dsIsSuavw/eSjj6 az3yd9yPGf+pi51+V1U8Qd/vGi/C7U67fCCTrNTxras41Ju9R1EBvOEz6vyfa87vrBMsUbp/L7yqS QO819BKb38kzxWTzTI4iXNT+Wsp7dv22Ejl+WybrHXbiMjcovpFKVohBKnqeCzOPOHFwXZnV/V8vj eWYsDBmh8wCsLuBZvcKrjElt2SyT1aTUD6Vh8I9h27tQuOraEz+Jgnv6BxXAsPagoqsyidsV0Lr8e V6s4ILttse7KTcSGEhBgFoxJPCa87KWezEdUr6NsNdUDTRjZcezxWPVjIP1+jgt7CqFuo2GHilM9c RsTdj2sQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8PGy-0000000EQHj-0tz8; Mon, 13 Oct 2025 20:36:00 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1v8PGv-0000000EQF3-3g1p for linux-arm-kernel@lists.infradead.org; Mon, 13 Oct 2025 20:35:59 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 5C55D43E98; Mon, 13 Oct 2025 20:35:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E744EC4CEFE; Mon, 13 Oct 2025 20:35:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760387757; bh=VRca4O5xWSvVtV07vu7T/vayv/vKzk4YtiAHpk59aYg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bhePkCQL/66n70lV9xZxYwRRP+VnIkS+CH6ARH9WtcldkTiOp5Ob386EHKyl3AMBa 9RYk+wDM4ovm/56mZ6bzkEEh9UnuW+WYeuSJUUus+TACOJTuYhJNsvGA+p75if0nIr eF/1rT4tHcaKgPPXNTve99sj8RqEvhRdV8+5zdkPR+FLUveu003ODzhiA2YZdSiMzN L6N60HePBPGl52ouzhwYD9vF78x7wP2Yvg3D7LD2eoI4MiHO+TabowgoVKZ1e5gdiV DR0pYSljDpr9QuAxXqKVRzlLFoIoLIv9vydg718x4I1aBRpQXVEM3pIv7QhMJ6fOYq +KzLX6+lrv2Iw== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Andrew Morton , Bjorn Helgaas , Catalin Marinas , Danilo Krummrich , "David S . Miller" , Eric Dumazet , Gabriele Monaco , Greg Kroah-Hartman , Ingo Molnar , Jakub Kicinski , Jens Axboe , Johannes Weiner , Lai Jiangshan , Marco Crivellari , Michal Hocko , Muchun Song , Paolo Abeni , Peter Zijlstra , Phil Auld , "Rafael J . Wysocki" , Roman Gushchin , Shakeel Butt , Simon Horman , Tejun Heo , Thomas Gleixner , Vlastimil Babka , Waiman Long , Will Deacon , cgroups@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-block@vger.kernel.org, linux-mm@kvack.org, linux-pci@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 31/33] kthread: Document kthread_affine_preferred() Date: Mon, 13 Oct 2025 22:31:44 +0200 Message-ID: <20251013203146.10162-32-frederic@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013203146.10162-1-frederic@kernel.org> References: <20251013203146.10162-1-frederic@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251013_133557_952000_7C957602 X-CRM114-Status: GOOD ( 12.26 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The documentation of this new API has been overlooked during its introduction. Fill the gap. Signed-off-by: Frederic Weisbecker --- kernel/kthread.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/kernel/kthread.c b/kernel/kthread.c index f3397cf7542a..b989aeaa441a 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -857,6 +857,18 @@ int kthreadd(void *unused) return 0; } +/** + * kthread_affine_preferred - Define a kthread's preferred affinity + * @p: thread created by kthread_create(). + * @cpumask: preferred mask of CPUs (might not be online, must be possible) for @k + * to run on. + * + * Similar to kthread_bind_mask() except that the affinity is not a requirement + * but rather a preference that can be constrained by CPU isolation or CPU hotplug. + * Must be called before the first wakeup of the kthread. + * + * Returns 0 if the affinity has been applied. + */ int kthread_affine_preferred(struct task_struct *p, const struct cpumask *mask) { struct kthread *kthread = to_kthread(p); -- 2.51.0